Russia launched a massive attack on Ukraine overnight into Saturday with hundreds of drones, killing at least one person, part of a stepped-up bombing campaign that has dashed hopes for a breakthrough in efforts to end the more than 3-year-old war.

Russia now controls more than two-thirds of Ukraine’s Donetsk region — the main theater of the ground war. Russian forces have carved out a 10-mile-deep pocket around the Ukrainian troops defending the crucial city of Kostiantynivka, partly surrounding them from the east, south and west.

Armed Conflict Location and Event Data (ACLED) said Russia began to hit enlistment centers in recent weeks in a concerted effort to disrupt Ukraine's mobilization. Olha Polishchuk, ACLED's Eastern Europe research manager,